顶棚有直接式和悬吊式两种，其中悬吊式称为吊顶。（)

How many people are unemployed in America according to OECD？

A．3.6 million.

B．13 million.

C．34 million.

D．44 million.

请帮忙给出正确答案和分析，谢谢！

When shopping online, make sure______.

A．you have installed the secured browser in the computer

B．you can see the secure lock displayed by your browser

C．you are alone when making the online purchase

D．you have entered the correct credit card number

请帮忙给出正确答案和分析，谢谢！

某幼儿园儿童午餐吃了红烧鲐巴鱼，餐后10分钟～2小时内，陆续有儿童出现面部、胸部及全身皮肤潮红，眼结膜充血，伴有头痛、恶心、腹痛、腹泻、心跳过速、血压下降等症状，个别出现荨麻疹，体温正常。这很可能是一起

A、沙门菌食物中毒

B、组胺中毒

C、副溶血性弧菌食物中毒

D、河豚鱼中毒

E、亚硝酸盐中毒

请帮忙给出正确答案和分析，谢谢！

Which of the following is NOT an abbreviation？

A．Prof.

B．Gang.

C．Ad.

D．Fridge.

请帮忙给出正确答案和分析，谢谢！

In the sentence "Many people observed the ship leaving the harbor" , the italicized part is______.

A．the object complement

B．an adverbial

C．the object

D．an appositive

请帮忙给出正确答案和分析，谢谢！