搜题请搜索小程序“爱下问搜题”
问题 选择题

火星与地球的质量之比为P，半径之比为q，则火星表面的重力加速度和地球表面的重力加速度之比为（　　）

A．

p
q2

B．pq2

C．

p
q

D．pq

答案

星球表面的物体受到的重力等于万有引力，即G

M m
R2
=mg

解得g=G

M
R2

所以

g火
g地
=
m火R地2
m地R火2
=
p
q2
．

故选A．

阅读理解
Are you crazy about adventures? If so, enjoy the trips we have specially designed for you:
ABSOLUTE MOTHER OF ALL ADVENTURE ACTIVITIES
Calling all thrill seekers．．．Try our extreme trio of wind, water and wave．．．
Enjoy a wonderful helicopter flight over the Cape Peninsular．An adventure you will never forget! A 1．5 hour bay sail on a stylish yacht （游艇）．A pure sailing experience that will show you Cape Town like you've never seen her before．A one hour high speed racing boat ride with 2 × 250hp engine capacity! Fastest commercial boat ride in the world that's fun and safe．
For enquiries or bookings please contact us on 082 3711372 or wendy@ atlanticadventures. co．za
SHARK CAGE DIVING SPECIAL IN GANSBAAI
NO EXPERIENCE NECESSARY! Ages 6 to 60 + COMPLETELY SAFE, VIEWING OR SHARK CAGE DIVING．
Full day * Breakfast, Lunch and Refreshments* All equipment supplied: wetsuit, goggles, snorkel etc, just bring warm jacket, camera and sun-screen．Also view Fur Seals, Penguins, Whales （in season）, Dolphins etc．
Contact Bib on 083 8536144 or shark@aaax. co．za
HORSEBACK BEACH ADVENTURES
Enjoy leisurely beach rides on horseback．Be thrilled by a fast gallop if you have more experience and confidence．Our 12km riding path winds through some lovely bush paths with fascinating colourful and unusual birds to spy, alongside market gardens and onto a peaceful beach．Or use your break opportunity to visit the mangroves （红树林） on a pleasant boardwalk if this is your taste of fun．
Contact us on 084 4670752 or HorsebackBeachAdventures@gmail．com
TANDEM SKYDIVING
We skydive everyday weather permitting．No training is required．You will arrive at the drop zone and get a short briefing from a tandem instructor and then will go in the plane to 9,000ft above the ground．Just before exiting the plane the instructor hooks the passenger to him and you both exit the plane together．The free fall is done from 9,000ft till approximately 4,000ft after which the instructor will open the parachute （降落伞） and they both fly it to the ground to land．
For bookings / enquiries please contact us on 082 3711372 or Cathy@atlanticadzentures．co．za
小题1:Interested in a trip during which she can study plants along the seaside, which number will Kate dial?
A．082 3711372．B．083 8536144．
C．084 4670752．D．082 3711372．
小题2:Expecting to experience exciting races on water, Mr Grant, over 70, needs to send an email to _____．
A．wendy@atlanticadventures. co．za
B．shark@aaax. co．za
C．HorsebackBeachAdventures@gmail．com
D．Cathy@atlanticadventures. co．za
小题3:Which trip will provide you the opportunity to feel horrible animals face to face?
A．ABSOLUTE MOTHER OF ALL ADVENTURE ACTIVITIES
B．SHARK CAGE DIVING SPECIAL IN GANSBAAI
C．HORSEBACK BEACH ADVENTURES
D．TANDEM SKYDIVING
小题4:Which of the following statements is NOT true according to the passage?
A．ABSOLUTE MOTHER OF ALL ADVENTURE ACTIVITIES offers you a tour by air．
B．SHARK CAGE DIVING SPECIAL IN GANSBAAI requires no diving experience．
C．HORSEBACK BEACH ADVENTURES reaches as far as 12 kilometers．
D．During TANDEM SKYDIVING, you can operate the parachute．
查看答案
选择题

下列漫画主题与下列口号精神相近的是

A．人有多大胆，地有多大产

B．公共食堂好 吃饭不花钱

C．自愿又互利，发展合作社

D．联产承包制，走上富裕路
查看答案