Desert perennials lose their leaves after the rainy season just as trees lose theirs in wetter climates before winter arrives， but the reasons for this feature are different. A Right B Wrong C Not mentioned

The theme of the second last paragraph is why the perennials can survive as plants for several years.

    A Right B Wrong C Not mentioned

The shoot system of perennials can help the plants absorb less of the sun‘s ray.

    A Right B Wrong C Not mentioned

Winter is the toughest season for grasses and flowers to survive in desert.

    A Right B Wrong C Not mentioned

Grasses and flowers in the desert whose life cycles are short shows their ability to adapt to the quick disappearance of rainwater there after it falls in spring.

    A Right B Wrong C Not mentioned

Ordinary plants are unable to survive in the desert mainly because of the changeable weather.

    A Right B Wrong C Not mentioned

We guarantee that letters posted first class will arrive the next day.

    A request B realize

    C ensure D doubt

I remember seeing him somewhere previously.

    A before B ahead

    C seldom D secretly

His behaviour is in every way perfect.

    A attitude B conduct

    C intelligence D character

It‘s impolite to cut in when two persons are holding a conversation.

    A leave B spend

    C stand up D interrupt

uring his lifetime he was able to accumulate quite a fortune.

    A control B spend

    C collect D exchange