四分体时期常会发生互换,下列哪个图可正确表示交叉互换? [ ]
A.
B.
C.
D.
答案:B
Rather than ______ at home, he prefers ______ out to play football even on a cold day.
A.to stay; to go
B.staying; to go
C.stay; to go
D.staying; going
温水浴的温度常用33~35℃;热水浴温度是36~38℃。