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1Scientists study ____ human brains work to make computers.
A.when
B.how
C.that
D.whether
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2I make $2,000 a week, 60 surely won’t make ______ difference to me.
A.that a big
B.a that big
C.big a that
D.that big a
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3He will come to understand your efforts sooner or later. It’s just a matter of _____.
A.luck
B.value
C.time
D.fact
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4This training program can give you a lift at work, ____ increase your income by 40%.
A.as well as
B.so long as
C.so much as
D.as soon as
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5In our class there are 46 students, _____ half wear glasses.
A.in whom
B.in them
C.of whom
D.of them
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6I got close enough to hear them speaking Chinese, and I said “Ni Hao ” just as I ____ do in Chin
A.A.must
B.might
C.can
D.should
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7It’s surprising that your brother _____ Russian so quickly—he hasn’t lived there very long.
A.picked up
B.looked up
C.put up
D.made up
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8 Lightning flashed through the darkness over Sibson’s bedroom skylight（天窗）.Sibson was shaken by a clap of thunder ____21___ he knew what was happening. The storm had moved directly _____22____ his two-story wooden house. Then he heard the smoke alarm beeping. Sibson rushed down the stairs barefoot to 23 ; he opened the door to the basement（地下室）, and flames 24 out. Sibson ran back upstairs to call 911 from his bedroom. “I felt 25 because the room had a separate outdoor stairway,” he explains. But the phone didn’t work, and when he tried to go down the outdoor stairway, he was 26 by a wall of flames. Sibson realized he was trapped（困住）. Sibson’s house was three kilometers 27 the main road and was so well hidden by trees that he knew calling for help would be 28 . Up a hill nearby lived Sibson’s neighbor, Huggons. He was lying in bed when something like a smoke alarm 29 his ears. He jumped out of bed, took his 30 and flashlight, and headed down the hillside toward the 31 . That was when he saw the rolling heavy smoke. Huggons dialed 911, and the operator warned him not to 32 the house. But Huggons said, “There is no way I am going to listen to Sibson 33 and die in that fire.” “Anyone there、” Huggons called out. Then he heard “Help! I’m trapped!” coming from the second floor balcony（阳台）. He entered the house, but soon had to run back to catch his 34 . After one more 35 inside the house, Huggons gave up and 36 around back. The wind parted the smoke just 37 for him to catch sight of Sibson. But there was no way to get to him. He 38 the flashlight into the woods and noticed a ladder. He took it over to the balcony and 39 Sibson down just as the second floor of the house fell off. Sibson is still 40 when he tells the story. “ I was alone that night,” he says. “Then I heard the most beautiful sound in my life. It was Huggons.”
A.before
B.while
C.since
D.until
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9What can be learned from Paragraph 2、
A.The scenes are colorful and changeable.
B.There are many windows in the wooden house.
C.The views remind us that we are in a wooden house.
D.The lakes outside the windows are quite different in color.
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10By mentioning the names of the trees, the author aims to show that ______ .
A.the kids like playing in trees
B.the kids are very familiar with trees
C.the kids have learned much knowledge
D.the kids find trees useful learning tools
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