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