关于TIA的实验实检查，不正确的是（）。 A.CT检查不能排除脑出血、硬膜下血肿 B
题型：单项选择题
问题：
关于TIA的实验实检查，不正确的是（）。
A.CT检查不能排除脑出血、硬膜下血肿
B.发病24小时内应完成MRI检查
C.CT检查可以排除脑肿瘤、动静脉畸形、动脉瘤等临床表现与TIA相似的疾病
D.彩色经颅多普勒检查可了解颅内动脉狭窄的情况
E.血常规及生化检查是必要的
题型：单项选择题
阅读理解。
WHY IS THE SUN IMPORTANT?
The sun is a huge, hot, bright star. It is important because without it there would be no life on Earth. The
sun gives us light and heat.
All living things need light and heat from the sun to live. Plants need light and heat to grow. They use the
light from the sun to make food. We cannot make our own food, but plants can. All the food we eat comes
from plants in a food chain (链) which starts with the sun. For example,
Animals need sunlight, too. Just like us, their food comes from a food chain which begins with the sun
and the plants.
sun→ leaf→ caterpillar (毛虫)→bird
sun→ seaweed (海藻)→small fish→ whale (鲸)
Sunlight means we can see during the day. If there was no sun, it would be dark all the time. Even when
the sky is cloudy, the sunlight is very strong and it shines through the clouds.
1. Which words tell us what the sun is like?
A. Huge. (大的)
B. Hot.
C. Bright.
D. All above.
2. What are the two main things the sun gives us?
A. Light and heat.
B. Heat and eggs.
C. Corn and light.
D. Wheat and bread.
3. Why can we still see during the day when the sky is cloudy?
A. Because we can see all day and all night.
B. Because the sun can't give us light all day long.
C. Because the sunlight can shine through the clouds.
D. Because we can't see at night.
4. All the food we eat comes from _____. And it starts with the _____.
A. plants; earth
B. a food chain; sun
C. food; sun
D. plants; star
5. In what way do you think the sun cannot be harmful (有害的)?
A. The sun can do harm to your eyes and skin.
B. It can make rivers too dry.
C. Without it there would be no life on Earth.
D. Hot sun on dry land can cause fires.