Now old Henry is very sad, so he doesn't

题型:选择题

问题:

Now old Henry is very sad, so he doesn't want to do         .

A.something

B.nothing

C.anything

D.everything

考点:不定代词
题型:选择题

鸡慢性呼吸道病血清学诊断最常用的试验是()

A.全血平板凝集反应

B.血清平板凝集反应

C.全血琼脂扩散反应

D.血清琼脂扩散反应

E.试管凝集反应

题型:选择题

—I'm green at everything.

—Don't worry.________you get older,  you will get more experience.[ ]

A. As  

B. Till

C. Unless  

D. Since

题型:选择题

阅读理解。

     The house was quiet at 5 a.m. and Tim's mother was asleep. Only the sound of the big freezer broke

the quiet. He'd dreamt of the cave last night? The purring (轻微颤动声) of the freezer had been the sea.

    Tim pulled on a sweater and put some apples into his schoolbag. It was too early for breakfast. He'd

eat after he'd been through the cave, sitting on the rocks and staring at the sea.

    He wished he had a proper pack. His schoolbag would have to do. What else? Sandwiches -but his

mother might wake up if he started pulling out bread for sandwiches. She'd want to know why he had to

leave so early. He settled for some biscuits, and left a note stuck to the table.

    Gone to Michael's. Back tonight. Tim.

    The sky was high and soft and light outside, though the sun still wasn't up. Even the highway up the hill

was quiet as he made his way down the street. The wind from the sea was fresh and sweet.

    The sandhills still breathed heat from yesterday's sun, though the top of the sand was cool. He ran

down to the beach impatiently, but there was no one, just dry sand dancing in the early wind and seabirds marching up and down watching the waves.

    The light changed suddenly. The first rays of sunlight stretched across the sea. The sun was pushing its

way over the edge of the world

    Over the first rocks, along to the point. Tim glanced back. The beach was still empty. The sun sailed

higher in the sky.

    He could see the cave now, even darker in the morning light. The sand turned silver then dark gold as

the water flowed away from it. He had to force himself to go closer. Why was it so much more mysterious now? But it would be silly to go back now after so much trouble. He needn't go in all the way...

1. What did Tim do at the beginning of the story?

A. He left the house quietly.    

B. He had breakfast at home.

C. He left a note on the freezer.

D. He put a sweater in his schoolbag.

2. "He settled for some biscuits" (in Paragraph 3) means that Tim             

A. had to leave the biscuits on the table.

B. liked biscuits better than sandwiches.

C. had to take biscuits instead of sandwiches.

D. could only find some biscuits in the kitchen.

3. Which of the following statements is TRUE according to the story?  

A. The sea looked like a piece of gold.

B. Seabirds flew away when Tim arrived.

C. Tim was the only person on the beach.

D. The sky got dark as Tim reached the cave.

4. In the story, Tim's mood changed from        .

A. loneliness to craziness

B. anxiousness to excitement

C. helplessness to happiness

D. eagerness to nervousness

题型:选择题

与光镜相比,用于电子显微镜的组织固定有什么特殊的要求?

题型:选择题

哮喘严重发作时,下列哪项是通气不足的可靠指标()

A.明显发绀

B.弥漫性哮鸣音

C.呼气性呼吸困难

D.PaO2<60mmHg

E.PaCO2>50mmHg

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