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【简答题】
型胚囊发育过程中，大孢子母细胞经过减数分裂形成四个大孢子，四个大孢子再发育成四个胚囊。( )
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举一反三
【单选题】Mr. Black asked _______to take these desks away.
A.
you and me
B.
you and he
C.
he and me
【单选题】Mr. Black asked___ to take these desks away.
A.
you and me
B.
you and he
C.
he and me
D.
/
【单选题】Economic reforms have ( ) the rural economy and increased farmers' incomes in recent years.近年来经济改革推进了乡镇经济的发展并提高了农民的收入。
A.
profile
B.
progress
C.
propelled
D.
protect
【单选题】要生成[0,20)之间的随机数,下面那句话正确?
A.
Random r=new Random(); int index=r.nextInt(20);
B.
Random r=new Random(); int index=r.nextInt(0,20);
C.
Random r=new Random(); int index=r.nextInt();
D.
Random r=new Random(); int index=r.nextInt(21);
【单选题】International ocean shipping constitutes a highly significant aspect of world economic and political relationships. The rapid growth in world trade and the emergence of new national entities in the la...
A.
consists of a lot of different aspects
B.
has been playing indispensable role in the world trade
C.
has generally its own free specific business environment
D.
has been playing an ever more significant role in the growth of world trade
【单选题】Movie makers feared for a while that they might be put out of business by television. Recently,【C1】______, more and more people have been going to the movies. This【C2】______be partly because the econo...
A.
especially
B.
furthermore
C.
however
D.
moreover
【单选题】水是常见的溶剂，许多物质可以在水中溶解，因而，在生活中常用水洗菜、洗碗、洗衣服．但不同的物质在水中溶解性不同，有的物质在水中就难以溶解．在生活中可向水中填加助溶剂溶解一些难溶于水的物质．根据你的生活经验，当衣服上有油污时，可向洗衣服的水中添加下列物质作助溶剂的是（ ）
A.
食盐
B.
白酒
C.
食醋
D.
洗涤剂
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