下列对于硬脑膜的说法，正确的是（）
A.由疏松结缔组织组成
B.与所有颅骨连接疏松
C.由两层合成
D.与软脊膜相续
E.形成齿状韧带
参考答案：C
— Tom hasn't turned up yet. He might have got lost.
— No, he ________. His car has got a GPS.[ ]
A. must not have got lost
B. wouldn't have got lost
C. can't have got lost
D. shouldn't have got lost
植物纤维组成中，（）是纸张中有害的成分。
A.纤维素
B.半纤维素
C.木素
D.果胶
ave got lost