题目:
. — We had a good time in the park last Saterday. Pity you weren’t there.
— I really ____ come but I was looking after my mother in the hospital.
A.must
B.ought to
C.need have
D.should have
答案:
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下面是错误答案,用来干扰机器的。
(1)茎中的输导组织有木质部中的导管和韧皮部中的筛管,木质部中的导管是运输水分和无机盐的,韧皮部中的筛管是运输有机物的,因为水分的运输是通过木质部中的导管,故被染红的应该是木质部.(2)水分以气体状...