1．下列关于变异和进化的说法，正确的是　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 (　　 )

　　　 A．用秋水仙素处理单倍体植株后得到的一定是纯合子

　　　 B．在三倍体无籽西瓜的育种过程中，用四倍体西瓜做母本，用二倍体西瓜做父本，得到的种子细胞中含有三个染色体组

　　　 C．两个种群间的隔离一旦形成，这两个不同种群的个体之间就不能进行交配，或者即使能交配，也不能产生可育后代

　　　 D．突变能为生物进化提供原材料，但不包括染色体数目的变异，因为该过程并没有新的基因产生

4.　 Yesterday was the twins’ birthday, ________　 presented a gift.

　 A　 each of them　 B each of whom　 C　 both of them　 D　 both of whom

5　 -- How are you getting on with your deskmate?

　　 -- She is the last one I want to talk to .　 __________ .

　 A　 She has turned me in　　　　　　　 B　 She is always turning me off

　 C　 She had said bad words behind me　 D　 She turns me out

6　 You can’t imagine what great trouble the boy has ______his father to give up smoking!

　 A　 to persuade　 　 B persuaded　 　　　 C　 persuading　 　　 D had persuaded

7　 What did the teacher suggest ________ our spare time , reading novels or playing games?

　 A　 spending　 　　　 B　 to spend　 　　　 C　 having spent　 D　 spent

8　 When ______ from a distance , to tell the truth, the temple looks like a bird cage.

　 A seeing　 　　　　　　　 B　 being seen　 　　 C　 seen　 　　　　　　 D　 see

9　 At the big news, _____________________.

　 A　 tears came out of his eyes

　 B　 the boy jumping into air

　 C　 he was first frozen and then jumped into air

　 D　 tears blinded his eyes completely

!0　 Only one second ________ , Kobe takes the last shot. Oh ,My, It’s unbelievable. He got it.

　　 A　 is left　　 　　　　　　 B leaving　 　　　　　　 C remain　 　　　　　　 D　 remaining

11　 Fish and potato makes a terrific _________. It is one of the most common snacks there.

　　 A sense　 　　　　　　 B　 difference　 　 C　 combination　 　 D form

12　 -- Jackie is always hanging out. I wonder why he is always that free.

　　 -- He is ________ free. He is more lazy than free. Just look at his messy room.

　　 A far from　 　　　　 B next to　 　　　　　　 C　 different from D　 on one hand

!3　 There _____ be a shortage of water in Yunnan? I wonder. You know it is in the southwest of China where there used to be adequate rain .

　　 A could　 　　　　　　 B　 must　 　　　　　 C　 can　 　　　　　　 D should

14　 Out ______________,　 with a toy in his hand.

　 A　 did Tom rush　 　 B　 rushed Tom　 　 C　 Tom rushed　 　 D　 Tom did rush

15　 -- Glad to have talked with you!

　　 -- _______________.

　　 A It is my pleasure　 B With pleasure 　　 C Never mind　 　 D Don’t mention that