(A) Textbooks list nine planets (行星) in the solar system (太阳系). Now, we might have a 10th.

This month, scientists announced that they   1  a small moon that may be circling a new planet, Xena (齐娜).

Xena is a planet-like body. People discovered (发现) it   2   2003. It's near Pluto (冥王星) and about 2,700 kilometres in diameter (直径). Pluto is 2,274 kilometres in diameter.

Scientists thought in 2003 that   3  was a possible 10th planet. It travels around the Sun, reflects (反射) sunlight and is   4  than Pluto. And now, it has a moon, which means that Xena   5   at least enough mass to keep a satellite (卫星).

American scientist Michael Brown, the discoverer of Xena, said, "Having a   6   is cool - and it is something that most planets have,   7   it is good to see that Xena does too."

It will   8  more work to decide whether Xena is a planet. And   9   Xena is, our textbooks will have to be changed.

(  )1. A. saw         B. found     C. heard       D. took

(  )2. A. in       B. on       C. at       D. for

(  )3. A. moon      B. earth     C. Xena   D. Pluto

(  )4. A. smaller     B. bigger   C. colder   D. warmer

(  )5. A. has     B. have     C. is       D. are

(  )6. A. Xena      B. sun      C. moon       D. stone

(  )7. A. and         B. but      C. or      D. so

(  )8. A. spend      B. cost      C. take     D. pay

(  )9. A. when      B. as       C. if       D. though

                 (B)

Sitting at the dinner table and sleeping in bed is normal for you. How is an astronaut's life aboard (在飞船上) Shenzhou VI  1   from yours?

Astronauts in a spaceship face a choice. They may pick their food with their hands and put it into their   2  . Or they may let the food   3   in the air. Then they float (漂) to the food and get it   4   their mouths. Astronauts have to remember to close their mouths tightly  5   eating. Any crumb could cause big trouble.

Bits of food that stay in the air can go into astronauts'  6   when they're breathing (呼吸).

Shenzhou VI astronauts sleep on the wall of the spaceship.

People float in a spaceship   7   there's no gravity (重力). So scientists fix sleeping bags to the wall to help astronauts get a sound   8  . Can they move any way they like? No!

(  )1. A. same    B. different   C. excited    D. relaxed

(  )2. A. mouths B. noses     C. hands     D. feet

(  )3. A. to stay   B. stay     C. staying    D. stayed

(  )4. A. at      B. on      C. with     D. for

(  )5. A. before   B. after     C. while       D. if

(  )6. A. bags     B. clothes    C. noses   D. shoes

(  )7. A. which    B. where     C. when     D. who

(  )8. A. sleep    B. asleep     C. sleepy     D. sleeping

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